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Delcam PowerMILL used for turbo milling demonstrations at Hermle Open House

The new turbo machining process using Delcam’s PowerMILL offers an alternative to broaching

Delcam’s PowerMILL software for five-axis machining is being used to program a novel machining method for the creation of "fir-tree” profiles in components for turbo machinery.  The new process, which provides an alternative to broaching, will be demonstrated during the Hermle Open House to be held at the company’s headquarters in Gosheim, Germany, from 24th to 27th April.

The milling approach, which is based on the trochoidal machining strategies in PowerMILL, has been patented by Iruba, a German provider of engineered solutions.  It allows complex "fir-tree” profiles to be produced on five-axis milling machines, such as those manufactured by Hermle, rather than having to use specialist broaching equipment.

The use of trochoidal strategies gives a number of benefits, in particular giving high material removal rates with lower, and more consistent, cutting forces.  The more consistent cutting forces also ensure higher accuracy in the position and in the shape of the slots, with minimal thermal effects on the surface of the profiles.  The process also reduces the number of specialist cutting tools that are required, and cuts the machining time in steel alloys by between 30 and 40 per cent, compared to alternative standard milling solutions, giving a time almost equal to broaching.

The new process was first demonstrated at the IMTS exhibition in Chicago last September, where is attracted considerable attention.  Mattias Rutschinski, Managing Director of Iruba explained, "At IMTS, we presented, with Hermle and Delcam, a world premiere by milling small fir-tree geometries into a disc of IN718, a typical material for aero engine parts.  The presentation impressed our visitors and made it very clear that milling is the more effective technology, since we could mill even curved slots, deburr them and measure them in one process on Hermle equipment.”

09 April 2013

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